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Pré-Publication, Document De Travail Année : 2009

Atom-Light Elementary Excitations in a Periodic Ensemble of Ultracold Atoms

Yvan Castin

Résumé

We derive the excitation spectrum for light coupled to atoms in an optical lattice, close to a 0 to 1 atomic transition, for the branches that are mainly of atomic nature. We explicitly include the quantum atomic motion, which leads to remarkable features such as a finite lifetime of the elementary excitations and their energy dependence with the lattice depth, that will show up in a real experiment as we discuss. It also makes the theory naturally divergence-free and resolves a controversy for the occurrence of a spectral gap.
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Dates et versions

hal-00365761 , version 1 (04-03-2009)
hal-00365761 , version 2 (16-09-2009)

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Mauro Antezza, Yvan Castin. Atom-Light Elementary Excitations in a Periodic Ensemble of Ultracold Atoms. 2009. ⟨hal-00365761v1⟩

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